The maximum unsigned number that can be represented in an LCC register is $[$maximumUnsignedNumber$].$

Answer requirements:

Use base $10($decimal$)$

Use an expression $($Note: a number by itself is an expression$)$ Use only numbers and arithmetic operators $($i$.$e$.,$ no spaces or parentheses$)$ Use ${?}^{{?}^{?}}$ as the symbol for exponentiation $($i$.$e$.,$ express $5^3$ as $5^{{?}^{{?}^{?}}}3).$